Spring ecological water requirement for the fishes in the Yellow River Estuary should meet the needs of the habitat and spawning ground of freshwater fishes, channel of migratory fishes, and spawning ground of offshore migratory fishes. According to the living habit of fishes, the time of runoff propagation, the mixing time of fresh water and salt water, and the discharge feature since the operation of the Xiaolangdi Reservoir, key attention should be paid to the water requirement from March to May. A minimum ecological flow discharge of 240 m3/s is needed according to the living habit of fishes and the continuity of the migration channel. A flow discharge pulse with a peak of 890 m3/s, lasting for 8d in the middle stage of April is also needed considering the pulse characteristics in nature period. In this condition, the runoff in spring is 21. 6×108 m3, satisfying the requirement of 21×108 m3 for the low salt spawning condition of offshore migratory fishes. The mean annual spring runoff is 21×108 m3 since the operation of the Xiaolangdi Reservoir. It is of great feasibility to satisfy the fish ecological water requirement by optimizing the annual or the interannual operation modes.
于守兵,张朝晖,徐丛亮.黄河河口鱼类春季生态需水[J].水利水电科技进展,2020,40(3):1-7.(YU Shoubing, ZHANG Zhaohui, XU Congliang. Spring ecological water requirement for fishes in Yellow River Estuary[J]. Advances in Science and Technology of Water Resources,2020,40(3):1-7.(in Chinese))Copy